Attachment plug



Mafch 17, 1925.

T. A. BOTH ATTACHMENT PLUG Filed May 28, 1921 lil-V3.4

Jaxx www Patented Mar. 17, 1925.

UNITED STATES PATENT OFFICE.

TONJES A. BOTH, OF STRATFORD, CONNECTICUT, ASSIGNOR TO THE CONNECTICUT ELECTRIC MANUFACTURING COMPANY, OF BRIDGEPOR'I, CONNECTICUT, A COR- PORATION OF CONNECTICUT.

ATTACHMENT PLUG.

Application led May 28, 1921.

To aZZ whom t may concern.'

Be it known that I, ToNJns A. BOTH, a citizen of the United States, residing at Stratford, county of Fairfield, State of Connecticut, have invented an Improvement in Attachment Plugs, of which the following is a specication.

My invention relates to electric connectors for completing the circuit through one or more conductors and has todo more especially with means for aiiixing the leads to a connecting plug shown for purposes of illustration as being of the screw threaded type. The object of this invention is to f produce a simplified device of the above character which shall be of ri 'd construction and adapted to be assem led without the use of a screw driver or other tools ordinarily required.

To these and other ends my invention consists in certain improvements and combination of parts as will be pointed out with greater particularity in the claims appended to the specification.

Referring to the drawings- Figure l shows my improved plug assembled. i.

Figure 2 is a longitudinal section through the assembled plug shown in Figure 1.

Figure 3 shows a top View of the device of Figure l.

Figure 4; shows the parts of my plug separated just prior to their assembly.

Figure 5 indicates a section on the line 5 5 of Figure 2.

Figure 6is a section on Figure 2.

Figure 7 shows the bolt previous to the same being molded-'finto the insulating material forming the complementary portion of my plug.

the line 6-6 of Figure 8 shows the ferrule 14 before thesame has been moldedI into the insulating body portion of the plug.

In purchasing the screw plug connector,

orwhen as frequently happens, one or more of the leads-to the usual screw plug connector become broken, it is not an easy task for an unskilled layman to insert the wire to the ordinary binding posts because of the trouble in demounting, using-the necessary screw driver or pliers andthe time required in assembling. By theffuse of my invention these objections are-overcome and Serial N0. 473,264.

the same result accomplished with greater convenience and without the expendlture of so much time or skill.

The numeral 10 indicates the main body portion of my plug, preferably formed of moldable insulating material provided with the necessary bore 11 or recess for the conducting leads 13 to be inserted therethrough. rlhe bore 11 is provided adjacent the lower part thereof with branches 12 whereby the bared ends of the conducting leads may be separated and clamped in a position insu lated from one another. The ferrule 14 provided with internal screw threads is preferably secured in position by having the insulating material molded around the same, and for this purpose a groove 15 or other surface roughening means may be used to more securely hold the ferrule in place. The lower or complementary portion 16 of my plug may also be formed of moldable insulating material and provided with a bolt 17 molded in the center thereof as shown. Here again the bolt 17 may be provided with a groove 18 or other means for more securely holding the same in the insulating material and preventing longitudinal movement thereof. The upper part of the bolt is provided with external screw threads 19 adapted for cooperation with the internal threads of the ferrule, while the lower or bottom portion 20 thereof is adapted to make connection with a corresponding conductor in a lamp socket. Surrounding the lower portion of the main body of the plug 10 is a sleeve 21 preferably of copper or other suitable conducting material, which in the embodiment shown is provided with external screw threads 22 on the periphery thereof for the purpose of co-operating with corresponding internal conducting screw threa s in a lamp socket. The lower ed e of this conducting sleeve 21 is preferab y inturned as shown at 23 in order that the inturned edge may form a seat for contacting with one of the bared conductors. The other bared conductor may engage a seat 24 formed on the bolt 17 so that when the lower or complementary portion 16 is clamped against the body portion 10 by means of the screw threads 19, one of the conducting leads 13 will be clamped in engagement with the ferrule or bolt, while the other will be pressed between the inturned flange -or edge A 23 of the sleeve 21 and the corresponding seat therefor in the main body portion 10. In order to prevent relative rotation between the sleeve 21 and the body portion 10 a stamped-out lip Q5 may be formed in the 4sleeve and adapted to engage a cut away port-ion in the body part 10. It this cut away portion is made in the form of a channel 26, the sleeve 21 may be easily slipped on and off the body part and yet prevented from rotating.

Among the advantages of my invention may be enumerated the ease of assemblage, whereby 'fewer motions are necessary, and the only tool required being the ordinary jack-knife for Skinning the ends of the insulated conducting leads. The fact that my plug comprises only three parts as shown in Figure 4; does away with the use of the usual binding screws which are liable to work loose and become lost.' If desired the end portions of the complementary members 10 and 16 may be knurled, as at 27 or otherwise roughened in order to form a convenient grasp for turning the one relative to the other. The sleeve 2l does not turn independently of the body portion 10 and therefore there is no likelihood for the conductor while in contact therewith being twisted on its seat. Epitomized, a simple connecting plug of rigid and substantial construction has been producedV which is capable of being easily and quickly connected with its leads without the use of the usual tools.

I claim 1. In an attachment plug, complementary insulating portions, complementary threaded engaging means molded in the respective portions for connecting said portions together and Contact and wire terminals, said terminals adapted to have conducting leads connected thereto by the manual operation of screwing the portions together.

2. In an attachment plug, the combination of an insulating body portion recessed to receive spread apart ends of conducting leads, a threaded sleeve, a contact and wire terminal non-rotatable and slidable over said body portion, a complementary insulating portion and complementary threaded engaging means molded into the respective insulating portions and forming a center contact and wire terminal, said terminals adapted to have the conducting leads connected thereto by the manual operation of screwing the body and complementary portions together.

3. In an attachment plug, the combination of an insulating body portion recessed to receive spaced apart ends of conducting leads. a threaded sleevecontact and wire terminal non-rotatable and slidable over said body' portion, a threaded bushing in said body portion, and a complementary insulating portion having a stud secured therein so as to rotate therewith and provided with a threaded shank to engage said bushing and form a center contactl and wire terminal, said terminals adapted to have the conducting leads connected thereto by the manual operation of screwing` the body and complementary portions together.

4. In a connector for a plurality of conductors comprising a plurality of contacts and wire terminals, complementary insulating portions with complementary means molded into the respective portions for connecting the parts together, said means adapted to form one or' said contacts and wire terminals, and also to have a conducting` lead connected thereto by the manual operation of connecting the insulating portions together.

5. In a connector for a plurality of conductors comprising complementary insulating portions, complementary threaded engaging means molded in the respect-ive portions for connecting the portions together', said means adapted to form a center contact and wire terminal, and a sleeve forming another contact and wire terminal, said terminals adapted to have the conducting leads connected thereto by the manual opera?- tion of screwing the complementary portions together.

6. In an attachment plug, the combination with insulating complementary portions, one provided with an external screw threaded part and the other a co-operating internal threaded part molded therein for screwing said complementary portions together, seats between said complementary portions adapted to receive the bared ends of conducting leads, said ends being clamped thereon by said complementary portions when screwed together.

7. In an attachment plug, the combination with abody portion of insulating material, of a second insulating portion, means carried by said portions adapted for threaded en'- gagement by relative rotature between said portions, metallic contacts carried by said portions and adapted to engage conducting leads when the same are held between said portions and said portions screwed together.

8. In an attachment plug, a body portion of insulating material recessed to receive the spaced apart ends of conducting leads, a second insulating portion. meansA carried by said portions adapted for threaded engage- :mentJ by relative rotation between said portions, metallic seats insulated from one another but carriedl by and between said portions and adapted to engage the ends of a pair of conducting leads held onto said seats by the threaded engagement of said means.

9. In an attachment plug, the combination with a body portion of insulating material recessed to receive the spaced apart ends of conducting leads and provided with means having internal screw threads, of a metal sleeve carried by said body portion, a second insulating portion provided with meanshaving external screw threads to engage the internal threads of the body lportion by relative rotation between said insulating portions, a metal seat surrounding the external threads, and a second metal seat formed by the inturned edge of said sleeve. each of said seats adapted to receive the end of a conducting lead held in engagement therewith when said body and second mentioned portions Aare screwed together.

10. In an attachment plug, the combination with a body portion of insulating material recessed to receive the spaced apart ends of conducting leads of a non-rotatable threaded sleeve slidable over the bod portion, and having an inturned edge, a apted to be slid over an end of the body portion, a threaded metal ferrule molded into this same end portion of the body, and a complementary portion of insulating material having a bolt molded therein adapted for engagement with the threads of the ferrule and extending through said complementary portion, the inturned edge of the sleevev and the ferrule bein adapted to contact with the ends of con noting leads when the latter are clamped thereon by the body and complementary portions on screwing the bolt into the ferrule.

In testimony whereof I aiiix my signature.

TONJ ES A. BOTH. 

